code: def get_backend():
      """
      Get the current backend of Funsor.
  
      :return: either "numpy", "torch", or "jax".
      :rtype: str
      """
      return _FUNSOR_BACKEND
  
imports: import functools
  import inspect
  import pprint
  import re
  import sys
  import numpy
label_desc: Use image node_id 13 for calling a global function with example usage: get_backend() and returns: _FUNSOR_BACKEND